Effective interactions and elementary excitations in quantum liquids

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6490497

Pines, D

The effective interactions which provide a wavevector and frequency dependent restoring force for collective modes in quantum liquids are derived for the helium liquids by means of physical arguments and sum rule and continuity considerations. A simple model is used to take into account mode-mode coupling between collective and multiparticle excitations, and the results for the zero-temperature liquid /sup 4/He phonon-maxon-roton spectrum are shown to compare favorably with experiment and with microscopic calculation. The role played by spin-dependent backflow in liquid /sup 3/He is analyzed, and a physical interpretation of its variation with density and spin-polarization is presented. A progress report is given on recent work on effective interactions and elementary excitations in nuclear matter, with particular attention to features encountered in the latter system which have no counterparts in the helium liquids.

• Research Organization: Los Alamos National Lab., NM (USA); Illinois Univ., Urbana (USA). Dept. of Physics
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6490497
• Report Number(s): LA-UR-87-1707; CONF-8609163-11; ON: DE87010125
• Country of Publication: United States
• Language: English

Related Subjects

656002* -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DENSITY
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXCITATION SYSTEMS
FLUIDS
HELIUM 3
HELIUM 4
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MECHANICS
NUCLEI
PHONONS
PHYSICAL PROPERTIES
QUANTUM FLUIDS
QUANTUM MECHANICS
QUASI PARTICLES
STABLE ISOTOPES